>Number:         4514
>Category:       kern
>Synopsis:       Bug in PMTU discovery and/or routing code?
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people (Kernel Bug People)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Nov 16 22:35:01 1997
>Last-Modified:
>Originator:     Michael Graff
>Organization:
flame.org:  yes, we do know everything
>Release:        Fri Nov 14 12:29:46 EST 1997
>Environment:
	
System: NetBSD kechara.flame.org 1.3_ALPHA NetBSD 1.3_ALPHA (KECHARA) #1: Fri Nov 14 12:29:46 EST 1997 explorer@kechara.flame.org:/u1/OS/NetBSD/src/sys/arch/i386/compile/KECHARA i386


>Description:
When using PMTU discovery, routes are added as MTUs are discovered:

Destination        Gateway            Flags     Refs     Use    Mtu  Interface
default            near-gw.cygnus.com UGS        42  1641364      -  de0
localhost          localhost          UH         11   195227      -  lo0
192.80.44          link#1             UC          0        0      -  de0
kechara            localhost          UGHS        5   202657      -  lo0
tel-aran-rhiod     link#1             UHL         3     3793    508  de0
amberdrake         00:80:ad:03:6c:62  UHL         2    38320    508  de0
aerie              00:80:ad:03:6c:62  UHL         4    18972    508  de0
192.80.44.255      link#1             UHL         1      955      -  de0

Now, there are no open sockets to tel-aran-rhiod.  The route was added
when PMTU discovered the route.  Shouldn't the Refs be 0, and the route
deleted?

This is bad, since with a web server talking to random PPP dialup clients,
the route map fills fast.
>How-To-Repeat:
Turn on PMTU and make a TCP connection
>Fix:
No idea...

>Audit-Trail:
>Unformatted: